Research on the Temperature Rise Characteristics ofMedium‐VoltageSwitchgear under Different Operation Conditions

Abstract

Non-member SF 6 is a greenhouse gas. Finding an alternative gas for SF 6 has become an urgent problem in the switch field. In order to explore the feasibility of replacing SF 6 gas with dry air directly, CO 2 and C 4 F 7 N/CO 2 mixed gas, based on the KYN28-12 medium voltage switchgear, the finite element method was used to solve the three-dimensional coupled multi-physics of the switchgear in this paper. From the angle of the temperature field and flow field, the temperature rise characteristics under different operation conditions were analyzed. The results showed that the temperature field and flow field distribution under the four gases were similar. Among them, the temperature rise of SF 6 gas was the smallest, followed by the C 4 F 7 N/CO 2 mixed gas, CO 2 and dry air. The flow rate of SF 6 gas was the lowest, about 0.11 m/s. The flow velocities of other gases were relatively close. When the switchgear was filled with the same gas, as the inflation pressure increased, the temperature rise of the switchgear decreased and the gas flow rate also dropped to a certain extent. The temperature field and flow field of the switchgear under the C 4 F 7 N/CO 2 mixed gas at 0.2 Mpa were similar to those under the 0.1 Mpa SF 6 gas. Under the C 4 F 7 N/CO 2 mixed gas, the contact failure of the plum contact made the temperature rise of the switchgear increase overall. The maximum temperature rise point transferred to the contact failure. The temperature rise further rose with the increase of the contact failure degree. The gas flow rate also greatly increased with the failure degree elevated. From the perspective of temperature rise, the C 4 F 7 N/CO 2 mixed gas has the possibility of being applied in the electrical equipment under the premise of meeting the insulation conditions.

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